Etria is a land of many. While there are 5 kingdoms, there is only the Empire. You may become any race that you would like, but wacth out for the Empire's hand.
A full list of the main races can be found here:
http://www.gaiaonline.com/guilds/viewtopic.php?t=23533961
Join requests:
Just click the join button and we will add you into the Empire.
KnightsRoyal
Ghost254
1234boo75
Uradel